铁矿球团中有机复合膨润土的强化机理  

An organic activated bentonite mechanism for improving pelletization

作　　者：朱德庆[1] 李慧敏[1] 余为 王斌[2] 潘建[1] 

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083 [2]武汉钢铁集团矿业有限公司鄂州球团厂,湖北鄂州436000

出　　处：《重庆大学学报（自然科学版）》2009年第5期582-588,共7页Journal of Chongqing University

基　　金：国家教育部高等学校优秀青年教师教学科研奖励基金资助项目(教人司[2000]26)

摘　　要：在球团生产中配加有机复合膨润土可明显提高生球强度、改善生球热稳定性、降低膨润土配比和提高球团矿铁品位。研究结果表明:在保证球团质量的前提下,有机复合膨润土配比为1.2%时即可达到常规膨润土加入量为2.2%时的生球强度,且爆裂温度均大于620℃,球团焙烧性能较好,成品球团矿的铁品位约提高了1.10个百分点。通过现代微观检测手段对有机复合膨润土作用机理的进行分析,发现有机小分子插入膨润土晶层间,其表面阴离子基团可与铁矿表面产生化学吸附,使其表面负电位增强和表面亲水性得到改善,有利于改善铁精矿成球性;另外,有机复合膨润土同时具有有机物和无机层状硅酸盐的特点,其热稳定性和高温粘结力均优于常规膨润土,改善了球团焙烧性能。Adding organic activated bentonite to palletizing production improves the thermal stability of green balls and the iron grade of fired pellets. This addition also permits a reduction in the bentonite dosage. We study the action mechanism of the organic activated bentonite. It is shown that the shock temperatures all exceed 620℃, the fired pellets iron grade increased 1.10 percent, and 1.2% organic activated bentonite satisfy the properties of green balls and fired pellets being activated, compared to 2.2 % traditional bentonite. It is revealed that organic molecules are inserted into the bentonite crystal layers, and the chemical adsorption of anionic-groups takes place on the iron ore surface of organic activated bentonite. This is shown by the presence of higher negative ζ-potential. The ballability of iron ore concentrates greatly improves, and the thermal stability and high temperature binding forces of organic activated bentonite are superior to those of traditional bentonite, leading to higher-strength green balls and fired pellets.

关 键 词：有机复合膨润土 球团矿 生球质量 铁品位 焙烧性能 

分 类 号：TF046.6[冶金工程—冶金物理化学]